Gold Mines And Mining
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Unplanned dilution back analysis in an underground mine using numerical models
Abstract In underground mines, stability problems can cause unplanned dilution, increasing the costs of mining operations, such as loading, transport, crushing and grinding. This is usually dealt with by simply increasing investments with support. However, the design geometry of stopes and drifts also has a great effect on a stope’s stability. The use of e
REM - International Engineering Journal. Publicado em: 2022
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2. Forecasting mass and metallurgical balance at a gold processing plant using modern multivariate statistics
Abstract Knowing the quantity and the quality of products and tailings generated by a beneficiation plant, even before ore processing, can make the mining operations more sustainable, more profitable, and safer. To forecast these values, it is necessary to submit samples to batch tests which mimic the processing workflow used on an industrial scale. Then, th
REM, Int. Eng. J.. Publicado em: 2020-12
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3. Peculiarities of drilling and blasting in underground small-scale mines
Abstract Artisanal and Small-scale Mining (ASM) is a prominent activity in the extractive industry: considering only gold, it produces about 20% of the world market supply. Despite this fact, ASM is generally associated with the negative aspects of its environ mental impact, and operational research is generally neglected. This article empha sizes the peculi
REM, Int. Eng. J.. Publicado em: 2020-09
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4. Estimation of mercury released from an abandoned gold mine in Minas Gerais, Brazil
Abstract Mining is very important to the economic, political and social development of the Minas Gerais State in Brazil ever since the time the country became a Portuguese colony in the early 1500s. However, few researches have been conducted to evaluate the environmental impacts associated with the mining activity at this time. There are many abandoned mine
REM, Int. Eng. J.. Publicado em: 2020-03
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5. Mine closure in Ouro Preto: the remnants of the 18th century gold rush and the tourism as an economic opportunity
Abstract Mine closure is the set of all activities that follow the end of the productive phase of a mine, characterizing itself as the process of returning an area transformed by mining into a new condition of sustainability, considering the potential future and the best possible reclamation of the area impacted. However, such an understanding was not concei
REM, Int. Eng. J.. Publicado em: 2019-03
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6. Depósitos auríferos associados ao magmatismo granítico do setor leste da Província de Alta Floresta (MT), Craton Amazônico: tipologia das mineralizações, modelos genéticos e implicações prospectivas / Granitoid-related gold deposits in the Alta Floresta Gold Province (MT), Amazon Craton: ore-forming processes, genetic models and implications to exploration
A Província Aurífera de Alta Floresta, porção centro-sul do Craton Amazônico, localiza-se entre os limites das províncias geocronológicas Ventuari - Tapajós (1,95-1,8 Ga) e Rio Negro - Juruena (1,8-1,55 Ga). Corresponde a uma unidade tectônica essencialmente composta por sequências plutono-vulcânicas geradas em ambiente de arcos magmáticos que se
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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7. Arsenic mobilization from sulfidic materials from gold mines in Minas Gerais State
Acid drainage results from exposition of sulfides to the atmosphere. Arsenopyrite is a sulfide that releases arsenic (As) to the environment when oxidized. This work evaluated the As mobility in six sulfidic geomaterials from gold mining areas in Minas Gerais State, Brazil. Grained samples (<2 mm) were periodically leached with distilled water, during 70 day
Química Nova. Publicado em: 2008
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8. ANÁLISE GEOQUÍMICA DE ÁGUA E DE SEDIMENTOS AFETADOS POR MINERAÇÕES NA BACIA HIDROGRÁFICA DO RIO CONCEIÇÃO, QUADRILÁTERO FERRÍFERO, MINAS GERAIS - BRASIL.
An environmental investigation was carried out in basin of the Conceição river, aiming at evaluate the geochemical characteristics of water and sediments, and to determine the influences of human activities in its composition and variations. The study area is located at the District of Santa Bárbara, Minas Gerais state - Brazil. Geologically it is inserte
Publicado em: 2006
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9. Modelagem geologica e estocastica da porção NE da Mina de Morro do Ouro, Paracatu (MG)
This dissertation presents a geostatistical study of a structurally-controlled, carbonaceous phyl1ite-hosted gold deposit with low gradelhigh tonnage characteristics. Gold in this mineralisation is hosted in boudinaged quartz veins that vary in size ftom 2 em up to 60 em. Larger quartz boudins are reported but only exceptionally. The boudins show maximum elo
Publicado em: 2001
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10. Geoquímica das Águas e dos Sedimentos da Bacia do Rio Gualaxo do Norte, Leste-Sudeste do Quadrilátero Ferrífero (MG): Estudo de uma Área Afetada por Atividades de Extração Mineral
The aim of the present geochemical study was to understand the physical-chemical behavior of water and sediments affected by anthropogenic interferences during almost three centuries of mining. Several analytical techniques were used which, together with geological and socio-economic information of the area, permitted to obtain a picture of the environmental
Publicado em: 2001
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11. Aspectos economicos da exploração mineral
This work deals with the main economic facts in which are included the mineral exploration, geological aspects, selection of areas, initial investments, its difficulties and deficiencies, its features, as well as the behavior of the mineral exploration in Brazil and other countries. Brazil, one of the greatest mining potentialities in the world, for its land
Publicado em: 1998
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12. Carcinoma of the lung in Ontario gold miners: possible aetiological factors.
A cohort of 54,128 men who worked in Ontario mines was observed for mortality between 1955 and 1986. Most of these men worked in nickel, gold, or uranium mines; a few worked in silver, iron, lead/zinc, or other ore mines. If mortality that occurred after a man had started to mine uranium was excluded, an excess of carcinoma of the lung was found among the 13